Buffing tool



F. RICKS BUFFING TOOL July A17', 1934.

Patented July 17, 1934 PATENT ori-"loi:

BUFFING TOOL Fred Ricks, I Leicester, England, assignor yto United Shoe Machinery Corporation, Paterson, N. J., a corporation of New Jersey Application November 14, 1933, Serial No. 697,965

.' In Great Britain January 25, 1933 V Claims.

'I'his invention relates to buiiing tools and is hereinV disclosed as embodied in an inilatable bufiing tool of the type disclosed in United States Letters Patent No. 849,338, granted April 2, 1907,

5 upon the application of Andrew W. Rogers. Such buiiingY toolsfare commonly known as Naumkeag tools and are used extensively in buing the soles .ofl shoes. The tool, as disclosed in the abovementioned patent, consists primarily of a substantially rigid tool body and an inflatable diskshaped pad secured upon the tool body for cushioning an abrasive cover. The abrasive cover is also 'disk-shaped and has its marginal portion turned over they edges of the inflatable pad and l5 secured to the rear surface of the tool body. Such abrasive covers may be applied to the tools by means of a device such as is disclosed in United States Letters Patent No. 871,990, granted Nov. 26, 1907, upon the application of John Gelzenzolichter. In addition to Naumkeag tools of the inflated type above referred to, there are .other Naumkeag tools wherein the abrasive cover is cushioned by a non-inflatable pad of felt, rubber, or other elastic material. For example of such non-inflatable tools reference may be had to an application for United States Letters Patent having Serial No. 102,688, iiled April 17, 1926, in the name of Fred Ricks and Edward F. Towndrow. The above-mentioned application of Ricks and Towndrow discloses also an improved abrasive cover having upstanding marginal tabs by which it may be clamped to the tool body, and having a central opening to accommodate a centering pin of a cover-applying device, disclosed in United VStates Letters Patent No. 1,917,329, granted July 11, 1933, on an application of Fred Ricks and Edward F. Towndrow.

It is an object of the present invention to provide an improved iniiatable buing tool upon which abrasive covers can be mounted by the use of an applying device having a centering pin. In accordance with a feature of the invention, the inflatable pad is provided with a recess to accommodate a centering pin. In the illustrated bufling tool the inflatable pad is composed of rubber and is relatively thin, having a boss upon the central portion of its inner surface, and an exterior recess is formed in the boss to accommodate the cen- `tering pin.

The invention consists of various features of construction, including the combination and arrangement of parts herein shown and claimed, the advantages of which will be apparent to fthose skilled in the art from a reading of the following description, reference being had to the accompanying drawing, in which,

Fig. 1 is a view in longitudinal cross-section of a bufling tool embodying my invention.

The body portion of the tool shown in Fig. 1 consists of a metal disk l0 formed upon an end of a tubular spindle 12 the outside of which is tapered to fit tightly into a rotary tubular shaft `of a bufing machine. The buiiing machine, which is not shown herein, may be similar to that disclosed in the above-mentioned patent to Rogers, and is provided with means for forcing air under pressure through its tubular shaft into the tool spindle. A pad 16, of flexible air-tight material, which in the illustrated tool consists of rubber,

has a marginal portion 18 which is secured upon` the rear face of the disk 10. In order to insure an air-tight joint between the disk 10 and the pad 16, there is provided an annular groove 20 in the disk 10 for receiving the marginal portion 18 ofthe pad 16. An abrasive cover 22 hasits marginal portion extending over the periphery of the pad 16. A clamping disk 24 is urged downwardly by a nut 26 threaded on the spindle 12 and serves to clamp the abrasive cover 22 against the margin 18 of the rubber pad, thereby securing the abrasive cover to the rear face of the tool body. 'I'he illustrated cover 22 is of the type disclosed in the above-mentioned application, Serial No. 102,688, having marginal tabs and having formed in it a central opening 34 to accommodate the centering pin of the cover-applying device. The pad 16 has a centrally located, inwardly extending boss 30 in which is formed a recess 32 which is open to the outside of the pad. 'I'he inner portion of the boss 30 is cone-shaped as indicated at 36, and the central portion of the metal disk 10 has formed in it a conical depression which is substantially complemental to the cone 36. The-depression 32, the cone 36 and the above-mentioned conical depression in the disk 10 are all coaxial with the tool body.

The cover 22 may be applied to the tool body by the use of a cover-applying device of the type disclosed in the above-mentioned Letters Patent No. 1,917,329. Such a cover-applying device is provided with a centering pin which may extend through the opening 34 in the abrasive cover and into the recess 32 of the pad 16. The centering pin may be provided with a shoulder so that only the portion of reduced diameter beyond the shoulder can enter the recess 32. The opening 34 in the abrasive cover, however, is of sufficient diameter to pass over the shoulder of the pin so as to avoid pressing the central portion of a molded abrasive cover against the pad. With the abrasive cover centered the applying device operates to wipe over the marginal tabs of the abrasive cover while leaving clearance between the outer face of the pad and the abrasive cover in the manner described in the above-mentioned Letters Patent No. 1,917,329. The material of the boss 30 at its closed end will, by contacting with the conical recess formed in the disk 10, act as a distance piece to locate the applying device and cover at the correct distance axially with relation to the tool. In the drawing, the central portion of the cover-engaging face of the pad 16 is shown flat, but when inflated the pad will distend toll the abrasive cover which has been molded to the curvature of the cover 22. As above stated, the cone 36 and the recess 32, as well as the conical depression in the disk 10, are coaxial with the tool body. The recess 32 thus serves to center the pin of the cover-applying device; and even if lateral pressure should unintentionally be exerted upon the cover-applying device, tending to stretch the rubber pad 16 and to pull the recess 32 out of center, such tendency will be overcome by the pressure of the cone 36 against the conical depression. Accurate centering of t e cover-ap plying device is thereby assured, notwithstanding the elasticity of the pad 16.

Having described rny invention, what I claim as new and desire to secure by Letters Patent o1" the United States is:

1. An abrading tool comprising a substantially rigid tool body, and an inatable pad secured upon said tool body for cushioning an abrasive cover, said pad having a recess to accommodate a device for centering the abrasive cover upon the pad.

2. An abrading tool of the Nauinkeag type comprising a substantially rigid rotary tool body, and an iniiatable disk-shaped pad secured upon said tool body for cushioning an abrasive cover, said tool body being constructed and arranged to admit air under pressure into the interior of said pad, and said pad having a central recess substantially coaxial with said tool body to accommodate a device for centering the abrasive cover upon the pad.

3. An abrading tool ofthe Naumkeag type comprising a substantially rigid rotary tool body, and an inflatable relatively thin disk-shaped rubber pad secured upon said tool body for cushioning an abrasive cover, said pad having a boss upon the central portion of its inner surface, in which boss is a recess open to the exterior of said pad to accommodate a pin for centering the abrasive cover upon the pad.

4. An abrading tool of the Naurnkeag type comprising a substantially rigid rotary tool body, and an inflatable disk-shaped pad secured upon said tool body for cushioning an abrasive cover, said pad having a boss upon the central portion of its inner surface, said boss and said tool body each having a cone-shaped portion which is substantially coaxial with said tool body, one of said coneshaped portions being substantially cornplernenv tal to the other, and said boss having an exterior' recessl to accommodate a pin for centering the IOO abrasive cover upon the pad, the cone-shaped portion of the tool body serving to center the cone-shaped portion of the boss and thereby to center the pin relatively to the tool body.

5. .A n abrading tool of the Naumkeag type com- 105 pri-sing a relatively rigid rotary tool body, an iniiatable disk-shaped pad secured upon said tool body and having an exterior recess substantially coaxial with said tool body, an abrasive cover for said pad, and means for securing the marginal 110 portion of said abrasive cover upon the rear surface of said tool body, said abrasive cover having a central opening to accommodate a pin which may be inserted in the recess of said pad to center the abrasive cover before the marginal portion 0f 115 the abrasive cover is secured to the tool body.

FRED RICKS. 

